Please don’t take this statement too literal.
Also, you are judging from a homo sapiens perspective and experience.
Unfortunantely, the human sexual experience is extremely limited, crippled and full of traumas.
Most humans are not sexually attractive to each other in the first place, not just because of genetics but also because of unhealthy lifestyle and deep traumas. If it would not be for strong biological urges and desparation our species would have long been gone.
Furthermore, most humans do not understand what sex really is and thus experience sex not as an energetic exchange but primarily as a mechanical biological act where the reptile brain makes all the decisions.
Of course that same reptile brain is also programmed in a way where it triggers sexual attraction only with individuals where the passing on of genes makes sense.
In the physical homo sapiens body and physical procreation being tied to sex, the physical genes have a strong influence of whom we find attractive and whom we find repelling.
It is a biological function to ensure that genes are transferred to the next generation in a certain optimized way.
None of these physical procreational rules exist on the astral planes and neither are they tied to sexuality (energy exchange)!
To all of this, we humans have then also added all the trauma, shame, guilt, societal and religious constructs etc. on top of it, distorting the nature of sex even more.
Judging higher concepts like sex from a physical human perspective is like trying to understand a 16-dimensional world with a 3-dimensional brain. It gives one a tiny fragment of the whole picture and that fragment will be heavily distorted and misunderstood.
Sexual energy is life force energy and a major building block of all of creation. Even all those Deity beings have in most cases a gender and are sexual beings with their own sexual expression (but most religious folks on our planet act as if these beings are all asexual “because there is no sex in the higher realms”). Nothing could be further from the truth and most of humanity is highly sexually repressed and traumatized.